fix multi_ack.
[git/git.git] / connect.c
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "quote.h"
4 #include "refs.h"
5 #include <sys/wait.h>
6 #include <sys/socket.h>
7 #include <netinet/in.h>
8 #include <arpa/inet.h>
9 #include <netdb.h>
10
11 static char *server_capabilities = NULL;
12
13 /*
14 * Read all the refs from the other end
15 */
16 struct ref **get_remote_heads(int in, struct ref **list,
17 int nr_match, char **match, int ignore_funny)
18 {
19 *list = NULL;
20 for (;;) {
21 struct ref *ref;
22 unsigned char old_sha1[20];
23 static char buffer[1000];
24 char *name;
25 int len, name_len;
26
27 len = packet_read_line(in, buffer, sizeof(buffer));
28 if (!len)
29 break;
30 if (buffer[len-1] == '\n')
31 buffer[--len] = 0;
32
33 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
34 die("protocol error: expected sha/ref, got '%s'", buffer);
35 name = buffer + 41;
36
37 if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
38 check_ref_format(name + 5))
39 continue;
40
41 name_len = strlen(name);
42 if (len != name_len + 41) {
43 if (server_capabilities)
44 free(server_capabilities);
45 server_capabilities = strdup(name + name_len + 1);
46 }
47
48 if (nr_match && !path_match(name, nr_match, match))
49 continue;
50 ref = xcalloc(1, sizeof(*ref) + len - 40);
51 memcpy(ref->old_sha1, old_sha1, 20);
52 memcpy(ref->name, buffer + 41, len - 40);
53 *list = ref;
54 list = &ref->next;
55 }
56 return list;
57 }
58
59 int server_supports(const char *feature)
60 {
61 return server_capabilities &&
62 strstr(server_capabilities, feature) != NULL;
63 }
64
65 int get_ack(int fd, unsigned char *result_sha1)
66 {
67 static char line[1000];
68 int len = packet_read_line(fd, line, sizeof(line));
69
70 if (!len)
71 die("git-fetch-pack: expected ACK/NAK, got EOF");
72 if (line[len-1] == '\n')
73 line[--len] = 0;
74 if (!strcmp(line, "NAK"))
75 return 0;
76 if (!strncmp(line, "ACK ", 3)) {
77 if (!get_sha1_hex(line+4, result_sha1)) {
78 if (strstr(line+45, "continue"))
79 return 2;
80 return 1;
81 }
82 }
83 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
84 }
85
86 int path_match(const char *path, int nr, char **match)
87 {
88 int i;
89 int pathlen = strlen(path);
90
91 for (i = 0; i < nr; i++) {
92 char *s = match[i];
93 int len = strlen(s);
94
95 if (!len || len > pathlen)
96 continue;
97 if (memcmp(path + pathlen - len, s, len))
98 continue;
99 if (pathlen > len && path[pathlen - len - 1] != '/')
100 continue;
101 *s = 0;
102 return 1;
103 }
104 return 0;
105 }
106
107 struct refspec {
108 char *src;
109 char *dst;
110 char force;
111 };
112
113 /*
114 * A:B means fast forward remote B with local A.
115 * +A:B means overwrite remote B with local A.
116 * +A is a shorthand for +A:A.
117 * A is a shorthand for A:A.
118 */
119 static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
120 {
121 int i;
122 struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
123 for (i = 0; i < nr_refspec; i++) {
124 char *sp, *dp, *ep;
125 sp = refspec[i];
126 if (*sp == '+') {
127 rs[i].force = 1;
128 sp++;
129 }
130 ep = strchr(sp, ':');
131 if (ep) {
132 dp = ep + 1;
133 *ep = 0;
134 }
135 else
136 dp = sp;
137 rs[i].src = sp;
138 rs[i].dst = dp;
139 }
140 rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
141 return rs;
142 }
143
144 static int count_refspec_match(const char *pattern,
145 struct ref *refs,
146 struct ref **matched_ref)
147 {
148 int match;
149 int patlen = strlen(pattern);
150
151 for (match = 0; refs; refs = refs->next) {
152 char *name = refs->name;
153 int namelen = strlen(name);
154 if (namelen < patlen ||
155 memcmp(name + namelen - patlen, pattern, patlen))
156 continue;
157 if (namelen != patlen && name[namelen - patlen - 1] != '/')
158 continue;
159 match++;
160 *matched_ref = refs;
161 }
162 return match;
163 }
164
165 static void link_dst_tail(struct ref *ref, struct ref ***tail)
166 {
167 **tail = ref;
168 *tail = &ref->next;
169 **tail = NULL;
170 }
171
172 static struct ref *try_explicit_object_name(const char *name)
173 {
174 unsigned char sha1[20];
175 struct ref *ref;
176 int len;
177 if (get_sha1(name, sha1))
178 return NULL;
179 len = strlen(name) + 1;
180 ref = xcalloc(1, sizeof(*ref) + len);
181 memcpy(ref->name, name, len);
182 memcpy(ref->new_sha1, sha1, 20);
183 return ref;
184 }
185
186 static int match_explicit_refs(struct ref *src, struct ref *dst,
187 struct ref ***dst_tail, struct refspec *rs)
188 {
189 int i, errs;
190 for (i = errs = 0; rs[i].src; i++) {
191 struct ref *matched_src, *matched_dst;
192
193 matched_src = matched_dst = NULL;
194 switch (count_refspec_match(rs[i].src, src, &matched_src)) {
195 case 1:
196 break;
197 case 0:
198 /* The source could be in the get_sha1() format
199 * not a reference name.
200 */
201 matched_src = try_explicit_object_name(rs[i].src);
202 if (matched_src)
203 break;
204 errs = 1;
205 error("src refspec %s does not match any.",
206 rs[i].src);
207 break;
208 default:
209 errs = 1;
210 error("src refspec %s matches more than one.",
211 rs[i].src);
212 break;
213 }
214 switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
215 case 1:
216 break;
217 case 0:
218 if (!memcmp(rs[i].dst, "refs/", 5)) {
219 int len = strlen(rs[i].dst) + 1;
220 matched_dst = xcalloc(1, sizeof(*dst) + len);
221 memcpy(matched_dst->name, rs[i].dst, len);
222 link_dst_tail(matched_dst, dst_tail);
223 }
224 else if (!strcmp(rs[i].src, rs[i].dst) &&
225 matched_src) {
226 /* pushing "master:master" when
227 * remote does not have master yet.
228 */
229 int len = strlen(matched_src->name) + 1;
230 matched_dst = xcalloc(1, sizeof(*dst) + len);
231 memcpy(matched_dst->name, matched_src->name,
232 len);
233 link_dst_tail(matched_dst, dst_tail);
234 }
235 else {
236 errs = 1;
237 error("dst refspec %s does not match any "
238 "existing ref on the remote and does "
239 "not start with refs/.", rs[i].dst);
240 }
241 break;
242 default:
243 errs = 1;
244 error("dst refspec %s matches more than one.",
245 rs[i].dst);
246 break;
247 }
248 if (errs)
249 continue;
250 if (matched_dst->peer_ref) {
251 errs = 1;
252 error("dst ref %s receives from more than one src.",
253 matched_dst->name);
254 }
255 else {
256 matched_dst->peer_ref = matched_src;
257 matched_dst->force = rs[i].force;
258 }
259 }
260 return -errs;
261 }
262
263 static struct ref *find_ref_by_name(struct ref *list, const char *name)
264 {
265 for ( ; list; list = list->next)
266 if (!strcmp(list->name, name))
267 return list;
268 return NULL;
269 }
270
271 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
272 int nr_refspec, char **refspec, int all)
273 {
274 struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
275
276 if (nr_refspec)
277 return match_explicit_refs(src, dst, dst_tail, rs);
278
279 /* pick the remainder */
280 for ( ; src; src = src->next) {
281 struct ref *dst_peer;
282 if (src->peer_ref)
283 continue;
284 dst_peer = find_ref_by_name(dst, src->name);
285 if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
286 continue;
287 if (!dst_peer) {
288 /* Create a new one and link it */
289 int len = strlen(src->name) + 1;
290 dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
291 memcpy(dst_peer->name, src->name, len);
292 memcpy(dst_peer->new_sha1, src->new_sha1, 20);
293 link_dst_tail(dst_peer, dst_tail);
294 }
295 dst_peer->peer_ref = src;
296 }
297 return 0;
298 }
299
300 enum protocol {
301 PROTO_LOCAL = 1,
302 PROTO_SSH,
303 PROTO_GIT,
304 };
305
306 static enum protocol get_protocol(const char *name)
307 {
308 if (!strcmp(name, "ssh"))
309 return PROTO_SSH;
310 if (!strcmp(name, "git"))
311 return PROTO_GIT;
312 if (!strcmp(name, "git+ssh"))
313 return PROTO_SSH;
314 if (!strcmp(name, "ssh+git"))
315 return PROTO_SSH;
316 die("I don't handle protocol '%s'", name);
317 }
318
319 #define STR_(s) # s
320 #define STR(s) STR_(s)
321
322 #ifndef NO_IPV6
323
324 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
325 {
326 int sockfd = -1;
327 char *colon, *end;
328 char *port = STR(DEFAULT_GIT_PORT);
329 struct addrinfo hints, *ai0, *ai;
330 int gai;
331
332 if (host[0] == '[') {
333 end = strchr(host + 1, ']');
334 if (end) {
335 *end = 0;
336 end++;
337 host++;
338 } else
339 end = host;
340 } else
341 end = host;
342 colon = strchr(end, ':');
343
344 if (colon) {
345 *colon = 0;
346 port = colon + 1;
347 }
348
349 memset(&hints, 0, sizeof(hints));
350 hints.ai_socktype = SOCK_STREAM;
351 hints.ai_protocol = IPPROTO_TCP;
352
353 gai = getaddrinfo(host, port, &hints, &ai);
354 if (gai)
355 die("Unable to look up %s (%s)", host, gai_strerror(gai));
356
357 for (ai0 = ai; ai; ai = ai->ai_next) {
358 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
359 if (sockfd < 0)
360 continue;
361 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
362 close(sockfd);
363 sockfd = -1;
364 continue;
365 }
366 break;
367 }
368
369 freeaddrinfo(ai0);
370
371 if (sockfd < 0)
372 die("unable to connect a socket (%s)", strerror(errno));
373
374 fd[0] = sockfd;
375 fd[1] = sockfd;
376 packet_write(sockfd, "%s %s\n", prog, path);
377 return 0;
378 }
379
380 #else /* NO_IPV6 */
381
382 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
383 {
384 int sockfd = -1;
385 char *colon, *end;
386 char *port = STR(DEFAULT_GIT_PORT), *ep;
387 struct hostent *he;
388 struct sockaddr_in sa;
389 char **ap;
390 unsigned int nport;
391
392 if (host[0] == '[') {
393 end = strchr(host + 1, ']');
394 if (end) {
395 *end = 0;
396 end++;
397 host++;
398 } else
399 end = host;
400 } else
401 end = host;
402 colon = strchr(end, ':');
403
404 if (colon) {
405 *colon = 0;
406 port = colon + 1;
407 }
408
409
410 he = gethostbyname(host);
411 if (!he)
412 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
413 nport = strtoul(port, &ep, 10);
414 if ( ep == port || *ep ) {
415 /* Not numeric */
416 struct servent *se = getservbyname(port,"tcp");
417 if ( !se )
418 die("Unknown port %s\n", port);
419 nport = se->s_port;
420 }
421
422 for (ap = he->h_addr_list; *ap; ap++) {
423 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
424 if (sockfd < 0)
425 continue;
426
427 memset(&sa, 0, sizeof sa);
428 sa.sin_family = he->h_addrtype;
429 sa.sin_port = htons(nport);
430 memcpy(&sa.sin_addr, ap, he->h_length);
431
432 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
433 close(sockfd);
434 sockfd = -1;
435 continue;
436 }
437 break;
438 }
439
440 if (sockfd < 0)
441 die("unable to connect a socket (%s)", strerror(errno));
442
443 fd[0] = sockfd;
444 fd[1] = sockfd;
445 packet_write(sockfd, "%s %s\n", prog, path);
446 return 0;
447 }
448
449 #endif /* NO_IPV6 */
450
451 /*
452 * Yeah, yeah, fixme. Need to pass in the heads etc.
453 */
454 int git_connect(int fd[2], char *url, const char *prog)
455 {
456 char command[1024];
457 char *host, *path;
458 char *colon;
459 int pipefd[2][2];
460 pid_t pid;
461 enum protocol protocol;
462
463 host = NULL;
464 path = url;
465 colon = strchr(url, ':');
466 protocol = PROTO_LOCAL;
467 if (colon) {
468 *colon = 0;
469 host = url;
470 path = colon+1;
471 protocol = PROTO_SSH;
472 if (!memcmp(path, "//", 2)) {
473 char *slash = strchr(path + 2, '/');
474 if (slash) {
475 int nr = slash - path - 2;
476 memmove(path, path+2, nr);
477 path[nr] = 0;
478 protocol = get_protocol(url);
479 host = path;
480 path = slash;
481 }
482 }
483 }
484
485 if (protocol == PROTO_GIT)
486 return git_tcp_connect(fd, prog, host, path);
487
488 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
489 die("unable to create pipe pair for communication");
490 pid = fork();
491 if (!pid) {
492 snprintf(command, sizeof(command), "%s %s", prog,
493 sq_quote(path));
494 dup2(pipefd[1][0], 0);
495 dup2(pipefd[0][1], 1);
496 close(pipefd[0][0]);
497 close(pipefd[0][1]);
498 close(pipefd[1][0]);
499 close(pipefd[1][1]);
500 if (protocol == PROTO_SSH) {
501 const char *ssh, *ssh_basename;
502 ssh = getenv("GIT_SSH");
503 if (!ssh) ssh = "ssh";
504 ssh_basename = strrchr(ssh, '/');
505 if (!ssh_basename)
506 ssh_basename = ssh;
507 else
508 ssh_basename++;
509 execlp(ssh, ssh_basename, host, command, NULL);
510 }
511 else
512 execlp("sh", "sh", "-c", command, NULL);
513 die("exec failed");
514 }
515 fd[0] = pipefd[0][0];
516 fd[1] = pipefd[1][1];
517 close(pipefd[0][1]);
518 close(pipefd[1][0]);
519 return pid;
520 }
521
522 int finish_connect(pid_t pid)
523 {
524 int ret;
525
526 for (;;) {
527 ret = waitpid(pid, NULL, 0);
528 if (!ret)
529 break;
530 if (errno != EINTR)
531 break;
532 }
533 return ret;
534 }